Steam-boiler.



D. S. JACOBUS.

STEAM BOILER.

APPLICATION FILED OCT. 14. 1915.

1 3 1 ,896 Patented July 3, 191?.

WITNESSES: r/) VTOR. ,a 4 [a v Q} ATTORNEYS.

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2 SHEETSSHEET 2- WITNESSES NVNOR.

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Patented July 3, 1917.

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DAVID S. JACOBUS, OE JERSEY CITY, NEW JERSEY, ASSIGNOR TO THE BAIBGOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

STEAM-BOILER.

Specification (if Letters Patent.

Patented July 3, 1917..

To all whom it may concern:

Be it known that I, DAVID S. JACOBUS, a

citizen of the United States, residing at Jersey City, in the-county of'Hudson and State of New Jersey, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification.

My invention relates to steam boilers, and will be understood by referring to the accompanying drawings, in which Figure 1 is a vertical longitudinal section through a Stirling boiler showing my invention ap plied thereto; Fig. 2 an enlarged detail of the form of yielding seal shown in Fig. 1; Fig. 3 a vertical longitudinal section through the lower part of. a Stirling boiler showing a modified arrangement of the bridge wall and a movable seal between the mud drum and the floor of the setting; Fig. 4 a detail of the seal of Fig. 1 at the lower end of the front baffle; Fig. 5 a section on the plane of the line 55 of Fig. 4; Fig. 6 a face view of one of the plates of Fi 4; Fig. 7 a section of one of the tubes 0 the rear leg of the superheater of Fig. 1; and Figs. 8, 9 and 10 detailed views illustrating modifications of the seals of Figs. 1, 2 and 3.

Similar reference numerals indicate similar parts in the several views.

Referring to Figs. 1 and 2, the boiler shown is of the general Stirling type comprising upper steam and water drums 1, 2 and 3, and a lower mud drum 4, the upper and lower drums being connected by the three banks of tubes 5, 6 and 7. The middle steam and water drum is connected with drums 1 and 3 by steam circulators 8, and by water circulators 9. The boiler is fired by any suitable furnace, a chain grate stoker being indicated at 10. A bridge wall 11 extends upwardly at the rear of the stoker to the side of the mud drum, and the front portion thereof extends up to near the front row of tubes of the front bank. This wall is protected by water boxes 12, located above the rear of the stoker. These boxes are connected to the boiler circulation through pipes 13, leading from the lower drum 4, and by pipes 14 extending from the boxes to the front steam and water drum 1. 'A baffle 15 is supported upon one of the rows of tubes of the front bank near stantially as indicated by the arrows, across the top of the front bank into the secondary combustion chamber at the rear of said bank. A baffle 16 is shown as supported upon the front row of tubes of the middle bank and extending downwardly from the middle steam and water drum. A baflle 17 issupported upon the rear row of tubes of the middle bank and extends upwardly from p the mud drum 4. In the particular system of bathing shown the third or rear bank of tubes is provided with a bafiie 18, which extends downwardly from the rear steam and water drum. A cross baffle 19 is placed between the front and middle banks and a cross baffle 20 is placed between the middle and rear banks, as shown. The gases after crossing the top portion of the front bank of tubes flow into the secondary combustion chamber 21 and thence in a general downward direction through said chamber and over the tubes of the front bank at the rear of the baflle 15 and the front row of the second bank, thence upwardly over the remaining tubes of the middle bank, downwardly over the tubes of the rear bank, and

.finally upward over the rear row of the rear bank to the'fiue outlet 22.

One feature of my invention consists of a yielding seal between the baffle 15 and the.

seal, and which permits a dust pocket 27 to be provided at the rear of the bridge wall 11 for depositing dust from the gases after they pass downward at the rear of the baflle 15, without involving leakage of the gases through the dust pocket, or short circuiting of the hot gases. This seal, as shown in Figs. 1 and 2 consists of a line of overlapping cast iron plates 23 fitted around the tubes from side to side of the boiler, at the lower end of baffle 15, and held in place by tube clamps 24. The plates 23 are shown as having bent lower ends projecting down into a seal which, in the form shown, consists of a 2 bar or angle iron 25 extending the width of the bridge wall and held thereto by means of tie-bolts 26, attached to short lengths of embedded angle irons. The seal 25 contains loose asbestos or other non-combustible packing or sealing material, which covers the ends of the plates 23, and makes a sufficiently tight joint to practically prevent leakage of air or gases between the baflle and the bridge wall. A clearance of about an inch is left in all directions so that there will be no binding due to a movement of the boiler tubes on account of expansion In a Stirling boiler which is usually carried on the iron structural work, the mud drum moves forward and backward as well as up and down relatively to the brick work through expansion, .and the brldge wall seal must remain tight irrespectlve of such movement. A rigid form of seal between the front batlle 15 and the bridge wall 11 would result in moving the bridge wall forward toward the fire and cause trouble in maintaining the bridge wall. With a rigid seal a movement back and forth of the boiler tubes will allow dust and soot to settle between the tubes and the bridge wall when the mud drum moves away from the furnace, and this would bank between the tubes, making a solid mass, and upon the mud drum moving toward the furnace the bridge wall would be pushed toward the fire.

The dust and soot which collects in the pocket 27, at the rear of the bridge wall, may be removed through the door 28 in the side wall.

In Fig. 3 I have shown the plates 29, which make up the bridge wall seal, straight instead of bent, as in Fig. 1. These plates are inserted edgewise between two rows of tubes, as indicated 'in Fig. 4, and then turned so as to overlap, as shown in Fig. The plates are recessed at 29 so as to fit around the tubes, and are of such length as to extend into the cup or angle iron 25, which latter is filled with loose asbestos, as in Fig. 1. A door 29 is provided for scraping or blowing out dust and soot from above the seal. It is important that the seal be protected from the radiant heat of the fire, which would cause the dust and soot which collects above it to become caked. This is accomplished by extending the bridge wall upward in front of the seal. Suflicient space is left above the seal between the boiler tubes and the bridge wall for blowing out the dust and soot by means of a steam or air lance.

In Fig. 3 I have shown a seal between the lower part of the mud drum 1 and the floor to prevent the gases from the pocket 27 from passing beneath the mud drum. This seal consists of a flexible plate 30 attached to the mud drum and terminating above the floor in a seal consisting of two angle irons 31 extending the width of the boiler. There is suflicient clearance to permit of the movement of the plate 30 Wltlb out bending it to such an extent that would move its lower, or free end, from between the angle irons 31, when the mud drum moves forward and backward through expansion. In this form the dust pocket 27 is located in the rear of the bridge wall and in front of the lower flexible seal. The

dust is taken out from this pocket through the door 28.

Instead ofthe movable seal of Flgs. 1 and 2, I may use the yielding seal of Fig. 8, consisting of a flexible p1ece 37 secured at one end to a tie-bolt 26, and at the other end to a tube' clamp 24.

In Fig. 9 I have shown a sliding seal which may be used instead of the flex ble seal 30 of Fig. 3. This consists of a p1ece 38 secured to the mud drum 4, and of the bearing piece or pieces 39, the upper ends of which will slide back and forth over the piece 38. The lower ends of the pieces 39 rest in a groove or seat in the floor.

In Fig. 10 a form of sliding seal is shown which may be used in lieu of that of F1gs.-l, 2 and 8. This consists of pieces 40 secured to a tube clamp 24, and having their free ends bent upward to receive and support one end of a plate 41 resting upon a seat in the rear of the bridge wall. Plate 41 will move back and forth over this seat as the mud drum and tubes move, due to expansion and contraction. A sea] of the construction shown in Fig. 10 may be used beneath the mud drum of the boiler, in

which case the piece 40 would be attached to the -mud drum and the piece 41 would slide on the floor beneath the mud drum.

Another feature of my invention relates to the super-heater in the secondary combustion chamber between the front and middle banks of tubes. In the form shown this comprises the boxes or headers 32' and 33 to which the upwardly projecting U-shaped tubes 34 are connected. The box 32, which is near the furnace, or front of the boiler, is at a higher level than the box 33, and is in close proximity to the rear of the front bank of generating tubes. The header 33 is in close proximity to the front row of tubes of the second or middle bank. This spacing apart of the boxes spreads the legs of the superheater tubes, lessens the overturning moment of the tubes 34, and provides a superheater which does not require supports other than the supporting crossboxes or headers. The boiler steam is led from the middle steam and water. drum 2 through the main 35 to header 32, and

leaves the superheater through header 33.

posit blocking up the front legs of the tubes if the cores are omitted.

What I claim and desire to secure by Letters Patent of the United States, is

1. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a baffle in said bank to direct the course of the gases, a furnace having a bridge wall, and a yielding seal between said battle and bridge wall to permit of a movement of the lower part of the bank of tubes relatively to the bridge wall and to prevent leakage of the gases.

2. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a furnace having a bridge wall, a baflie in said bank of tubes stopping short of the lower drum and extending upwardly from a point back of the bridge wall to the upper part of the bank of tubes, and a yielding seal between said bafile and bridge wall to permit of a movement of the lower part of the bank of tubes relatively to the bridge wall and to prevent leakage of the gases.

3. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a baflie in said bank to direct the course of the ases, a furnace having a bridge wall, a yie ding seal between said baffle and bridge wall to permit of a movement of the lower part of the bank of tubes relatively to the bridge wall and to prevent leakage of the gases, and a dust pocket in the rear of the bridge wall below said seal.

4. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a furnace having a bridge wall extending to the lower drum, a bafile in said bank of tubes stopping short of the lower drum and extending upwardly from a point back of the bridge wall to the upper part of the bank, and a yielding seal between said bafiie and bridge wall to permit of a movement of the lower part of the bank of tubes relatively to the bridge wall and to prevent leakage of the gases.

5. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a fur nace having a bridge wall, a baflie in said bank to direct the course of the gases, an extension from said bafile, and plates supported upon said extension and the bridge wall to provide a yielding seal to permit of a movement of the lower part of the bank of tubes relatively to the bridge wall and to prevent leakage of the gases. 6O

6. A steam boiler comprising a bank of generating tubes, upper and lower drums into which said tubes are expanded, a baflle in said bank to direct the course of the ases, a furnacehaving a bridge wall, a yielding seal between said baffle and bridge wall to permit of a movement of the lower part of i the bank of tubes relativelyvto the bridge wall and to prevent leakage of the gases, and a second yielding seal between the lower drum and the floor.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

- DAVID S. JACUBUS.

Witnesses:

EUGENE P. TERRY,

E. L. BRINKERHOFF. 

